Past perfect tense expresses an action completed in the past before another action happened. Formed by using had + past participle form of the verb. Use had + past participle for a positive sentence and had not/hadn't + past participle for a negative sentence.
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Past perfect tense expresses an action completed in the past before another action happened. Formed by using had + past participle form of the verb. Use had + past participle for a positive sentence and had not/hadn't + past participle for a negative sentence.
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